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Seasonal variation in plant biomass and net primary productivity of grazinglands in the forest zone of Garhwal Himalaya

Seasonal variation in plant biomass and net primary productivity of grazinglands in the forest zone of Garhwal Himalaya

Tropical Ecology 35(1): 115-131

ISSN/ISBN: 0564-3295

Seasonal variation in plant biomass and net primary productivity of four grazinglands (one each in oak and pine forests and two in open locations on SE and SW aspects) in the forest zone of Garhwal Himalaya are presented. The time-series of live shoot biomass exhibited a unimodel growth pattern with peak live shoot biomass of 165-596 g m-2 attained in September. The net aboveground production was 169-614 g m-2 yr-1 and the total belowground net production ranged from 116-305 g m-2 yr-1. The order for total net production was: SW grazingland gt SE grazingland gt pine gt grazingland gt oak grazingland. Maximum ANP in all the sites (84-90% of annual ANP) was elaborated during the rainy season while bulk of the BNP (57-64% of annual BNP) was obtained during the winter season. The total net production ranged from 286-896 g m-2. The turnover rates of the total plant biomass were greatest in the rainy season and the least during the summer season. Replacement of canopy biomass was maximum during the rainy season, while that of belowground biomass was maximum during the winter. The system transfer functions in all the grazinglands showed that most of the dry matter was channelled to the aboveground production (55-69%) than to the belowground production (31-45%).

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